Eight-character idioms describing ignorance, no wind and no rain

Pronunciation: büjīng yüshy, büzhüng yüzh.

Interpretation: wisdom: wisdom, insight. You can't increase your understanding of a thing without experiencing it.

Example: As the saying goes, "~" Now that I know, it's time for you to ask me again! (Cao Qingxue Qin's "Dream of Red Mansions" 60th time)